title: Protective function of nitric oxide on marine phytoplankton under abiotic stresses.
abstract: As an important signaling molecule, nitric oxide (NO) plays diverse physiological functions in plants, which has gained particular attention in recent years. We investigated the roles of NO in the growth of marine phytoplankton Platymonas subcordiforms and Skeletonema costatum under abiotic stresses. The growth of these two microalgae was obviously inhibited under non-metal stress (sodium selenium, Na2SeO3), heavy metal stress (lead nitrate, Pb(NO3)2), pesticide stress (methomyl) and UV radiation stress. After the addition of different low concentrations of exogenous NO (10(-10)-10(-8) mol L(-1)) twice each day during cultivation, the growth of these two microalgae was obviously promoted. Results showed that NO could relieve the oxidative stresses to protect the growth of the two microalgae. For different environmental stress, there is a different optimum NO concentration for marine phytoplankton. It is speculated that the protective effect of NO is related to its antioxidant ability.
authors.affiliation: Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266003, PR China.
authors.forename: Peifeng
authors.initials: P
authors.lastname: Li
authors.forename: Chun-Ying
authors.initials: CY
authors.lastname: Liu
authors.forename: Huanhuan
authors.initials: H
authors.lastname: Liu
authors.forename: Qiang
authors.initials: Q
authors.lastname: Zhang
authors.forename: Lili
authors.initials: L
authors.lastname: Wang
mesh_terms: D000704:Analysis of Variance; D000975:Antioxidants / Q000494:pharmacology*; D049109:Cell Proliferation / Q000187:drug effects; D006861:Hydrogen Peroxide / Q000378:metabolism; D019216:Metals, Heavy / Q000633:toxicity; D008724:Methomyl / Q000633:toxicity; D009569:Nitric Oxide / Q000494:pharmacology*; D018384:Oxidative Stress / Q000187:drug effects* / Q000528:radiation effects; D010839:Phytoplankton / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism / Q000528:radiation effects; D013482:Superoxide Dismutase / Q000378:metabolism; D014466:Ultraviolet Rays
chemical_list: D000975:Antioxidants; D019216:Metals, Heavy; D008724:Methomyl; D009569:Nitric Oxide; D006861:Hydrogen Peroxide; D013482:Superoxide Dismutase
keywords: ABA; Abiotic stress; CAT; GPX; GR; MDA; Marine phytoplankton; NO; NOS; Nitric oxide (NO); Optimum concentration; POD; Protective effect; ROS; SOD; abscisic acid; catalase; glutathione reductase; guaiacol peroxidase; malondialdehyde; nitric oxide; nitric oxide synthase; peroxidase; reactive oxygen species; superoxide dismutase